Digital printing device for the dynamic printing of a statically printed substrate web and reel-fed printing press

Abstract

A digital printing device for the dynamic printing of a substrate web statically printed in a reel-fed printing press is disclosed. The digital printing device includes a position sensor which measures the substrate web for regulating a print position for the dynamic printing. The digital printing device is provided with a signal from a signal source of the reel-fed printing press. A position sensor control generates a synchronization signal and provides the synchronization signal to a digital printing head control. A speed signal transformer generates a feed signal and provides the feed signal to the digital printing head control. The digital printing head control activates the digital printing head dependent on the synchronization signal and the feed signal.

What is claimed is: 
     
       1. A digital printing device for dynamic printing of a substrate web statically printed in a reel-fed printing press, wherein the digital printing device performs the dynamic printing in line with the reel-fed printing press, comprising:
 a position sensor, which together with a digital printing head, is relocateable on a cross member transversely to a transport direction of the substrate web and measures the substrate web for regulating a print position for the dynamic printing; 
 an interface, wherein a signal from a signal source of the reel-fed printing press is receivable by the digital printing device via the interface, wherein the signal comprises a speed signal of the reel-fed printing press and a cylinder trigger signal of the reel-fed printing press; 
 a position sensor control that generates a synchronization signal based on the cylinder trigger signal and a measurement value of the position sensor, and provides the synchronization signal to a digital printing head control; and 
 a speed signal transformer that generates a feed signal based on the speed signal and a predetermined dynamic print resolution input by a user via an operator interface, and provides the feed signal to the digital printing head control; 
 wherein the digital printing head control activates the digital printing head in accordance with the synchronization signal and the feed signal; 
 and wherein a maximum printing speed of the dynamic printing and of the static printing are matched and limited to one another by a data comparison between the speed signal of the reel-fed printing press and the feed signal for the digital printing device with the predetermined dynamic print resolution. 
 
     
     
       2. The digital printing device according to  claim 1 , wherein the position sensor, the position sensor control, the speed signal transformer, the digital printing head control, and the digital printing head exchange time-critical data for the dynamic printing as hardware signals. 
     
     
       3. The digital printing device according to  claim 1 , wherein the position sensor control activates the cross member. 
     
     
       4. The digital printing device according to  claim 1 , wherein the signal is a hardware signal and is receivable from a central pickup of the reel-fed printing press or an encoder of the reel-fed printing press. 
     
     
       5. The digital printing device according to  claim 1 , wherein the position sensor, the position sensor control, the speed signal transformer, the digital printing head control, and the operator interface exchange non-time-critical data for the dynamic printing as network signals via a network. 
     
     
       6. The digital printing device according to  claim 5 , wherein via the operator interface preset values for the dynamic printing related to dynamic print resolution and/or brightness and contrast data for the position sensor and/or set values for the print position of the dynamic printing are adjustable and transmittable via the network as network data. 
     
     
       7. The digital printing device according to  claim 1 , wherein a printing ink supply of the digital printing head exchanges time-critical data as hardware signals with the digital printing head control and exchanges non-time-critical data as network data via a network. 
     
     
       8. The digital printing device according to  claim 1 , wherein the feed signal is dependent on a cylinder circumference of the reel-fed printing press. 
     
     
       9. The digital printing device according to  claim 1 , wherein the synchronization signal is a function of a number of cylinder trigger impulses for each cylinder revolution of a cylinder of the reel-fed printing press. 
     
     
       10. A printing apparatus, comprising:
 a reel-fed printing press with a printing unit for static printing of a substrate web surface of a substrate web with a print image that is invariable for a print edition; and 
 a digital al printing device of  claim 1  for dynamic printing of the substrate web. 
 
     
     
       11. The printing apparatus according to  claim 10 , wherein the printing unit is an offset printing unit. 
     
     
       12. The printing apparatus according to  claim 10 , wherein the digital printing device includes an inkjet printing device.